Ventilating system

ABSTRACT

Disclosed is a ventilating system which is easily mounted by simplifying a coupling structure of a supply duct and an exhaust duct, the ventilating system including a cabinet mounted in a ceiling or a wall, for drawing in room air and discharging air into the room, a supply duct coupled with a first side of the cabinet, for guiding outdoor air to the cabinet, and an exhaust duct coupled with the first side of the cabinet, to which the supply duct is coupled, for guiding the room air into the room.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Application No. P2004-47647, filed on Jun. 24, 2004, which is hereby incorporated by reference as if fully set forth herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a ventilating system, and more particularly, to a ventilating system mounted in or attached to a ceiling or a wall of a room.

2. Discussion of the Related Art

In general, a ventilating system is an apparatus for ventilating a room space by supplying outdoor air into a room and discharging polluted room air to an outside of the room.

The ventilating system is provided with a filter for purifying outdoor air drawn from the outside of the room, so as to remove impurities such as dust contained in the outdoor air supplied into the room.

The ventilating system performing above-mentioned function is divided into a ceiling-mounted type ventilating system that is generally mounted in a ceiling so as not to be projected therefrom, and a ceiling-attached type ventilating system that is attached to the ceiling.

The ceiling-mounted type ventilating system and the ceiling-attached type ventilating system are coupled with a supply duct for guiding outdoor air into the room and an exhaust duct for guiding room air to an outside thereof. The room air guided by the supply duct is purified at a filter and supplied into the room so as to ventilate the room.

In order to mount the ventilating system, structured as above-mentioned, in the ceiling, it is essential that the supply duct and the exhaust duct provided at the ventilating system have a simple configuration structure and are mounted very easily.

Furthermore, in order to reduce a ceiling thickness of a building to which the ventilating system is mounted, the ventilating system needs to be thin in thickness.

In response to the requirement, a development of a ventilating system including the supply duct and the exhaust duct having a simple configuration structure and being easily mounted is on demand.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a ventilating system that substantially obviates one or more problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a ventilating system which is easily mounted by simplifying a coupling structure of a supply duct and an exhaust duct

Another object of the present invention is to provide a ventilating system having a minimum ceiling thickness for installation.

Another object of the present invention is to provide a ventilating system that may be used as an air purifier not only ventilating a room space but also purifying room air.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a ventilating system comprising a cabinet mounted in a ceiling or a wall, for drawing in room air and discharging air into a room; a supply duct coupled with a first side of the cabinet, for guiding outdoor air to the cabinet; and an exhaust duct coupled with the first side of the cabinet to which the supply duct is coupled, for guiding the room air into the room.

In this case, the cabinet is mounted in the ceiling or the wall. The cabinet comprises a first inlet for drawing in room air; a second inlet formed on the first side of the cabinet and coupled with the supply duct; at least one first outlet for discharging air into the room; and a second outlet formed on the first side of the cabinet having the second inlet formed thereat, and coupled with the supply duct.

The cabinet further comprises a filter for purifying at least one first outlet. The cabinet further comprises a third inlet for drawing in room air and communicating with the exhaust duct; and a fan for generating an air suction force so as to draw in air into the cabinet.

The filter purifies air flowed into the cabinet through the first inlet and the second inlet. In this case, the filter is provided between the first inlet and the fan.

In the mean time, the supply duct guides outdoor air to between the first inlet and the filter. The fan comprises a centrifugal fan.

In addition, it is desirable that the ventilating system further comprises an air cutoff for selectively cutting off outdoor air flowed into the cabinet through the supply duct. The air cutoff is provided at either side of the second inlet or the supply duct of the cabinet.

The cabinet further comprises a suction louver for opening/closing the first inlet. The cabinet further comprises a wind-direction controlling louver for controlling a direction of air discharged from the at least one first outlet.

The first inlet is formed at a center of a surface facing an interior of the cabinet, and the at least one first outlet is formed at an edge of a surface facing the interior of the cabinet. In this case, the at least one first outlet is formed at a second edge except an edge of a side coupling the supply duct with the exhaust duct.

The ventilating system further comprises a regeneration heat exchanger for exchanging heat between outdoor air guided by the supply duct and room air guided by the exhaust duct.

It is desirable that the supply duct and the exhaust duct are mounted in a direction perpendicular to a thickness direction of a ceiling or a wall having the cabinet mounted thereon.

The cabinet structured as abovementioned is formed in a hexahedral shape.

In another aspect of the present invention, a ventilating system comprises a cabinet mounted in a ceiling or a wall of a room, formed in a hexahedral form, and having a first inlet for drawing in interior air and a first outlet for discharging purified air into the room, both the first inlet and the first outlet formed respectively on a surface facing the room; a supply duct coupled with a first side of the cabinet and guiding outdoor air to the cabinet; and an exhaust duct coupled with the first side of the cabinet, which the supply duct is coupled on, and guiding interior air to an outside thereof, wherein, the supply duct and the exhaust duct are mounted to be parallel to each other in a direction perpendicular to a thickness direction of a ceiling or a wall having the cabinet mounted thereon.

In this case, the cabinet further comprises a third inlet for drawing in interior air and communicating with the exhaust duct; a damper for selectively cutting off air flowed into the cabinet through the supply duct; and a regeneration heat exchanger for exchanging heat between outdoor air guided by the supply duct and interior air guided by the exhaust duct.

Owing to the foregoing structure of the ventilating system, it is easy to mount the ventilating system in a ceiling or a wall, and an installing space is minimized.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings;

FIG. 1 illustrates a diagram schematically showing a ventilating system in accordance with a first embodiment of the present invention mounted in a ceiling of a room;

FIG. 2 illustrates a top perspective view showing an inside structure of a cabinet provided at the ventilating system in accordance with the present invention operating in an air purifying mode;

FIG. 3 illustrates a bottom perspective view showing the cabinet provided in the ventilating system in accordance with the present invention operating in the air purifying mode;

FIG. 4 illustrates a top perspective view showing an inside structure of the cabinet provided in the ventilating system in accordance with the present invention operating in a ventilation mode;

FIG. 5 illustrates a bottom perspective view showing the cabinet provided in the ventilating system in accordance with the present invention operating in the ventilation mode;

FIG. 6 illustrates a diagram schematically showing a ventilating system in accordance with a second embodiment of the present invention mounted in a ceiling of a room;

FIG. 7 illustrates a diagram schematically showing the ventilating system in accordance with the second embodiment of the present invention attached to a wall; and

FIG. 8 illustrates a diagram schematically showing the ventilating system in accordance with the second embodiment of the present invention attached to the wall.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

A function of a ventilating system will be described for helping to understand the present invention. The ventilating system in accordance with the present invention is an apparatus for ventilating a room by purifying outdoor air and supplying purified air into the room while discharging polluted room air to an outside thereof.

Furthermore, the ventilating system in accordance with the present invention is a combination air-purifier and ventilator, which enables to operate as an air purifier for purifying the room air. Hereinafter, the ventilating system in accordance with the present invention will be described with reference to FIG. 1 to FIG. 5.

FIG. 1 illustrates a diagram schematically showing a ventilating system in accordance with a first embodiment of the present invention mounted in a ceiling of a room, FIG. 2 illustrates a top perspective view showing an inside structure of a cabinet provided at the ventilating system in accordance with the present invention operating in an air purifying mode, FIG. 3 illustrates a bottom perspective view showing the cabinet provided in the ventilating system in accordance with the present invention operating in the air purifying mode, FIG. 4 illustrates a top perspective view showing an inside structure of the cabinet provided in the ventilating system in accordance with the present invention operating in a ventilation mode, and FIG. 5 illustrates a bottom perspective view showing the cabinet provided in the ventilating system in accordance with the present invention operating in the ventilation mode.

Referring to FIG. 1 to FIG. 5, the ventilating system in accordance with the present invention includes a cabinet 100 mounted in the room, a supply duct 200 coupled with the cabinet, for guiding outdoor air to the cabinet, and an exhaust duct 300 coupled with the cabinet 100, for guiding the room air to an outside thereof.

In this case, the cabinet 100 is mounted in or attached to a ceiling 10 such that one surface of the cabinet 100 is exposed. The cabinet 100 may of course be mounted in or attached to a wall 20.

The supply duct 200 and the exhaust duct 300 are elongated in a same direction and passed through an outer wall of a building exposed to outdoor air.

For easily coupling the supply duct 200 and the exhaust duct 300 with the cabinet 100, it is desirable that ends of the supply duct 200 and the exhaust duct 300 are respectively coupled with a same side of the cabinet 100.

When the supply duct 200 and the exhaust duct 300 are coupled respectively with different surfaces of the cabinet 100, at least one of the supply duct 200 and the exhaust duct 300 is bent or cut so as to be coupled with the cabinet 100. Therefore, a mounting operation of the ventilating system is complex, airflow resistance is increased, and the duct is elongated in length.

Accordingly, if the cabinet 100 is mounted in the ceiling such that a first side of the cabinet 100 coupled with the supply duct 200 and the exhaust duct 300 faces the ends of the supply duct 200 and the exhaust duct 300 when the supply duct 200 and the exhaust duct 300 are mounted in a ceiling so as to be coupled with a same surface of the cabinet 100 during a building construction, a coupling operation that couples the cabinet 100 with the supply duct 200 and the exhaust duct 300 is simply carried out.

Although the cabinet 100 provided at the ventilating system may be formed in various forms, the cabinet 100 formed in a hexahedron, more particularly, in a rectangular parallelepiped having a thin thickness is introduced in this embodiment.

The cabinet 100 is configured to draw in room air and discharge air into a room at the same time. The cabinet 100 includes a first inlet 110 for drawing in room air, a second inlet 120 coupled with the supply duct 200, at least one first outlet for discharging air into the room, and a second outlet coupled with the exhaust duct 300.

The second inlet 120 and the second outlet 140 are formed on a same surface of the cabinet 100, and coupled respectively with the supply duct 200 and the exhaust duct 300.

In this case, the supply duct 200 and the exhaust duct 300 are inserted respectively into the second outlet 140 and the second inlet 120 so as to be coupled respectively thereto. Accordingly, the cabinet 100 is easily coupled respectively with the discharge duct 300 and the supply duct 200.

Due to the structure, when the room air drawn into the first inlet 110 is discharged through the exhaust duct 300 to an outside, and outdoor air flowed in by the supply duct 200 is discharged into the room through the first outlet 130, the ventilating system with the cabinet performs only a ventilating function.

In case that a filter 160 that purifies air discharged through the first outlet 130 into the room is provided in the cabinet 100, the ventilating system purifies outdoor air and supplies the purified air into the room.

In case of the ventilating system ventilating the room and supplying the purified air into the room at the same time, a filter for purifying air may be provided in the supply duct 200.

It is however desirable that the ventilating system in accordance with the present invention performs not only a function of ventilating room air but also a function of purifying the room air.

A first embodiment of the cabinet 100 provided in the combination purifier and ventilator will be described with reference to FIG. 2 to FIG. 5. Referring to FIG. 2 to FIG. 5, a fan 150 for forcing air to flow is provided in the cabinet 100, and a filter 160 for purifying air discharged to the first outlet 130. A separate fan 310 for forcing air to flow is provided in the exhaust duct 300 so as to discharge the room air to the outside.

The cabinet 100 further includes a third inlet 170 for drawing in the room air, that is, communicating with the exhaust duct 300, the room air discharged through the exhaust duct 300 to the outside.

Each structural element of the cabinet 100 will be described in more detail as follows. The first inlet 110 is formed on a lower surface of the cabinet 100, that is, in the middle of a surface facing the room, and the first outlet 130 and the third inlet 170 are formed on a lower edge of the cabinet 100.

In this case, it is desirable that the first outlet 130 is formed respectively at three edges except the edge coupled with the supply duct 200 and the exhaust duct 300. In other words, the fist outlet 130 is provided in a “

” form at the three sides of the first inlet 110.

A suction louver 111 is provided at the first inlet 110 for opening/closing the first inlet 110, and coupled to a motor, particularly, to a stepping motor, and at least one wind-direction controlling louver 131 is provided at the first outlet 130, for controlling direction of air discharged therefrom.

The at least one wind-direction controlling louver 131 is fixed at a predetermined angle or provided to be controlled manually, and preferably, to be rotated by the motor. In other words, the louver 131 is remained or automatically swung at a predetermined angle during an operation of the ventilating system, and the first outlet 130 is closed for preventing impurities from being entered therein during stoppage of the ventilating system.

The third inlet 170 is formed at an edge of a side coupled with the supply duct 200 and the exhaust duct 300, among edges of a lower surface of the cabinet 100, particularly, at a part lying at right angles to the second outlet 140 coupled with the exhaust duct 300.

Meanwhile, the filter 160 is provided at an upper part of the first inlet 110. At an upper part of the filter, the fan 150 is provided for generating a suction force so as to draw in air through the first inlet 110 and the second inlet 120.

In this case, the filter 160 removes impurities contained in the room air flowed through the first inlet 110 and in the outdoor air flowed through the second inlet 120. A separate filter assembly may further be provided at the cabinet 100 for removing minute impurities or bad smell.

A predetermined space is formed between the filter 160 and the first inlet 110. The outdoor air drawn in through the second inlet 120 coupled with the supply duct 200 and the room air drawn in through the first inlet 110 are flowed into the space formed between the first inlet and 110 the filter 160, and then moved upward by the operation of the fan 150 so as to be purified by the filter 160.

In the mean time, the fan 150 includes a motor, and a centrifugal fan 151 rotated by the motor. At the third edge of the fan and the filter 160, i.e., at an upper part of the first outlet 130, a passage is formed for guiding air to the first outlet 130, the air radially discharged from the fan 150.

In addition, it is desirable that the ventilating system further includes an air cutoff for selectively cutting off outdoor air flowed into cabinet 100 through the supply duct 200 such that the system is operated in an air purifying mode.

The air cutoff includes a damper 121 provided at the second inlet 120, the damper 121 rotated by a motor for dampers. The damper 121 may of course be provided at the supply duct 200, and a separate damper (not shown) may be provided at the exhaust duct 300 and either of the second outlet 140 and the third outlet.

In the mean time, it is desirable that the supply duct 200 and the exhaust duct 300 are provided in a direction perpendicular to the thickness direction of the ceiling, i.e., provided horizontally to be parallel to each other, such that the ceiling, wherein the ventilating system is mounted, is prevented from being increased in thickness. It is because the thickness of the ceiling is increased for mounting the supply duct 200 and the exhaust duct 300 therein when the supply duct 200 and the exhaust duct 300 are provided in the thickness direction of the ceiling.

When the cabinet 100 is mounted in or attached to a wall, it is desirable that the supply duct 200 and the exhaust duct 300 are provided to be parallel to each other in a direction perpendicular to the thickness direction of the wall.

It is also desirable that the second inlet 120 and the second outlet 140 are coupled respectively to a lower portion on the first side of the cabinet 100, the lower portion being coupled with the supply duct 200 and the exhaust duct 300. Accordingly, the thickness of the cabinet 100 is decreased.

The ventilating system in accordance with the present invention structured as above-mentioned is operated as follows. First, a case of operating the ventilating system in a ventilation mode will be described. When a power source is supplied to the ventilating system, the first inlet 110 is closed by the suction louver 111, the second inlet 120 is opened by the damper 121, and a fan 150 of the cabinet 100 and a fan 310 of the exhaust duct 300 are operated.

Accordingly, outdoor air is drawn into the cabinet 100 through the supply duct 200 and purified, passing through the filter 160. The air purified at the filter is radially discharged by the centrifugal fan 151 of the fan, and then discharged into the room through the first outlet 130.

In this instance, the wind-direction controlling louver 131 supplies fresh air into the room by controlling the direction of air discharged into the room. Meanwhile, the polluted room air drawn into the third inlet 170 by the fan 310 of the exhaust duct is discharged to the outside thereof through the second outlet 140 and the exhaust duct 300.

Through the process, the ventilation is performed for ventilating the room. Next, the process of operating the ventilating system in the air-purifying mode without ventilating the room air will be described.

When the power supply is supplied to the ventilating system, the suction louver 111 opens the first inlet 110, and the damper 121 closes the second inlet 120. Although the fan 150 of the cabinet is also operated, the fan 310 of the exhaust duct is not operated. By the operation of the fan 150 of the cabinet, the polluted room air is drawn into the cabinet 100 through the first inlet 110 and the air drawn into the cabinet 100 is purified, passing through the filter 160.

The air purified at the filter is then radially discharged via the centrifugal fan 151 of the fan and discharged into the room through the first inlet 130. In this instance, the wind-direction controlling louver 131 controls the direction of air discharged into the room. Through the process, the air purification is performed for purifying the room air.

In the mean time, the suction louver 111 opens the first inlet 110 and the damper 121 opens the second inlet 120. Ventilation and purification of the room air are performed at the same time when the fan 150 of the cabinet and the fan 310 of the exhaust duct are both operated.

Referring to FIG. 6 to FIG. 8, a second embodiment of the ventilating system in accordance with the present invention will be described. FIG. 6 illustrates a diagram schematically showing a ventilating system in accordance with a second embodiment of the present invention mounted in a ceiling of a room, FIG. 7 illustrates a diagram schematically showing the ventilating system in accordance with the second embodiment of the present invention attached to a wall, and FIG. 8 illustrates a diagram schematically showing the ventilating system in accordance with the second embodiment of the present invention attached to the wall.

The second embodiment of the ventilation system in accordance with the present invention further includes a regeneration heat exchanger 400 for exchanging heat between the outdoor air guided by the supply duct 200 and room air guided by the exhaust duct 300, such that a part of cool air of the room air is drawn back in summer and a part of warm air of the room air is drawn back by exchanging heat between the outdoor air guided by the supply duct 200 and the room air guided by the exhaust duct 300 at the regeneration heat exchanger 400.

The regeneration heat exchanger 400 includes a first flow tube 410 having a plurality of passages through which air flowing along the supply duct 200 passes, and a second flow tube 420 having a plurality of passages through which room air flowing along the exhaust duct 300 passes.

The first flow tube 410 and the second flow tube 420 are adjoined each other, and a bordering member adjoined to each other is made of a material having excellent heat conductivity. It is desirable that a supplementary fan 210 is provided at the supply duct 200 for improving a suction force of the outdoor air.

The cabinet 100 provided in the ventilation system in accordance with the second embodiment of the present invention, which is structured as above-mentioned, can be provided in various ways. For example, the cabinet 100 is mounted in a ceiling 10 as illustrate in FIG. 6 or in a wall 20 as illustrated in FIG. 7, or attached to the wall 20 as illustrated in FIG. 8.

The cabinet 100 can of course be attached to a corner of the ceiling 10. In this case, the supply duct 200 and the exhaust duct 300 cannot be seen. It is also understood that the cabinet 100 can be mounted in a half-mounted form wherein a half portion of the cabinet 100 is mounted in the ceiling 10 or in the wall 20.

Other structural elements except the regeneration heat exchanger are the same as those in the foregoing ventilating system in accordance with the first embodiment of the present invention, and identical parts will be given the same reference numbers will be used for the same elements, and repetitive description of which will be omitted.

First, according to the ventilating system in accordance with the present invention, since a supply duct and an exhaust duct are connected to a same side of the cabinet, duct during construction of a building, it is easy to mount the supply duct and the exhaust and to connect the supply duct and the exhaust duct with the cabinet.

Second, according to the ventilating system in accordance with the present invention, the supply duct and the exhaust duct are mounted in to be parallel to each other in a direction perpendicular to a thickness direction of a ceiling or a wall, thus a space for mounting the ventilating system is minimized.

Third, according to the ventilating system in accordance with the present invention, the thickness of the ceiling or the wall is prevented from being increased owing to the installation of the ventilating system, and story height is prevented from being increased. Therefore, construction expenditure is reduced.

Fourth, the ventilating system in accordance with the present invention is operated not only in a ventilation mode but also in an air-purifying mode. Therefore, room atmosphere is maintained pleasant.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. 

1. A ventilating system comprising: a cabinet mounted in a ceiling or a wall, for drawing in room air and discharging air into a room; a supply duct coupled with a first side of the cabinet, for guiding outdoor air to the cabinet; and an exhaust duct coupled with the first side of the cabinet to which the supply duct is coupled, for guiding the room air into the room.
 2. The ventilating system of claim 1, wherein the cabinet is mounted in the ceiling or the wall.
 3. The ventilating system of claim 1, wherein the cabinet comprises: a first inlet for drawing in room air; a second inlet formed on the first side of the cabinet and coupled with the supply duct; at least one first outlet for discharging air into the room; and a second outlet formed on the first side of the cabinet having the second inlet formed thereat, and coupled with the supply duct.
 4. The ventilating system of claim 3, wherein the cabinet further comprises a filter for purifying at least one first outlet.
 5. The ventilating system of claim 4, wherein the cabinet further comprises: a third inlet for drawing in room air and communicating with the exhaust duct; and a fan for generating an air suction force so as to draw in air into the cabinet.
 6. The ventilating system of claim 5, wherein the filter purifies air flowed into the cabinet through the first inlet and the second inlet.
 7. The ventilating system of claim 6, wherein the filter is provided between the first inlet and the fan.
 8. The ventilating system of claim 7, wherein the supply duct guides outdoor air to between the first inlet and the filter.
 9. The ventilating system of claim 6, wherein the fan comprises a centrifugal fan.
 10. The ventilating system of claim 6, further comprises an air cutoff for selectively cutting off outdoor air flowed into the cabinet through the supply duct.
 11. The ventilating system of claim 10, wherein the air cutoff is provided at either side of the second inlet or the supply duct of the cabinet.
 12. The ventilating system of claim 6, wherein the cabinet further comprises a suction louver for opening/closing the first inlet.
 13. The ventilating system of claim 3, wherein the cabinet further comprises a wind-direction controlling louver for controlling a direction of air discharged from the at least one first outlet.
 14. The ventilating system of claim 3, wherein the first inlet is formed at a center of a surface facing an interior of the cabinet, and the at least one first outlet is formed at an edge of a surface facing the interior of the cabinet.
 15. The ventilating system of claim 14, wherein the at least one first outlet is formed at a second edge except an edge of a side coupling the supply duct with the exhaust duct.
 16. The ventilating system of claim 1, further comprises a regeneration heat exchanger for exchanging heat between outdoor air guided by the supply duct and room air guided by the exhaust duct.
 17. The ventilating system of claim 1, wherein the supply duct and the exhaust duct are mounted in a direction perpendicular to a thickness direction of a ceiling or a wall having the cabinet mounted thereon.
 18. The ventilating system of claim 1, wherein the cabinet is formed in a hexahedral shape.
 19. A ventilating system comprising: a cabinet mounted in a ceiling or a wall of a room, formed in a hexahedral form, and having a first inlet for drawing in interior air and a first outlet for discharging purified air into the room, both the first inlet and the first outlet formed respectively on a surface facing the room; a supply duct coupled with a first side of the cabinet and guiding outdoor air to the cabinet; and an exhaust duct coupled with the first side of the cabinet, which the supply duct is coupled on, and guiding interior air to an outside thereof, wherein, the supply duct and the exhaust duct are mounted in to be parallel to each other in a direction perpendicular to a thickness direction of a ceiling or a wall having the cabinet mounted thereon.
 20. The ventilating system of claim 19, wherein the cabinet further comprises: a third inlet for drawing in interior air and communicating with the exhaust duct; a damper for selectively cutting off air flowed into the cabinet through the supply duct; and a regeneration heat exchanger for exchanging heat between outdoor air guided by the supply duct and interior air guided by the exhaust duct. 